Abstract
The thermal decomposition of trans-K[Cr(C2O4)2(OH2)2]·3H2O and cis-K[Cr(C2O4)2(OH2)2] has been studied using the TG–MS technique. The measurements were carried out in an argon atmosphere over the temperature range of 293–873 K. The influence of the complex structures and configurational geometry on the stability of the transition products and the pathways of thermal transformations has been discussed. Furthermore, the kinetics of the isomerization reactions of the [Cr(C2O4)2(OH2)2]− complex ion catalyzed by five different metal ions: Be2+, Mg2+, Ca2+, Sr2+ and Ba2+ have been studied. The isomerization reactions were studied in aqueous solution at five various temperatures (283–303 K), at constant concentration of metal ions (C = 0.1 M) and the constant ionic strength of solution (Na+, NO3 −) I = 2.4 M. The rates of the isomerization reaction were determined spectrophotometrically by monitoring of absorbance changes at 410 nm.
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This study was financially supported by Polish Ministry of Science and Higher Education under grants N N204 132040 and DS/8232-4-0088-1.
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Jacewicz, D., Wyrzykowski, D., Żamojć, K. et al. Thermal properties of potassium bis(oxalato)diaquochromates(III) in solid state. Trans–cis isomerization of the [Cr(C2O4)2(OH2)2]− complex ion in aqueous solutions. Struct Chem 23, 333–340 (2012). https://doi.org/10.1007/s11224-011-9876-y
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DOI: https://doi.org/10.1007/s11224-011-9876-y